use relaytool to weak link libssl

[inkscape.git] / acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
new file mode 100644 (file)
index 0000000..5cd65ae
--- /dev/null
+++ b/acinclude.m4
@@ -0,0 +1,30 @@
+dnl  Usage: RELAYTOOL(LIBRARY_NAME, LIBS, CFLAGS, ACTION-IF-WEAK-LINK-IS-POSSIBLE)
+
+dnl  Example:
+dnl  RELAYTOOL("gtkspell", GTKSPELL_LIBS, GTKSPELL_CFLAGS, gtkspell_weak=yes)
+dnl  Will modify GTKSPELL_LIBS to include a call to relaytool if available
+dnl  or if not, will modify GTKSPELL_CFLAGS to include -D switches to define
+dnl  libgtkspell_is_present=1 and libgtkspell_symbol_is_present=1
+
+AC_DEFUN([RELAYTOOL], [
+    if test -z "$RELAYTOOL_PROG"; then
+        AC_PATH_PROG(RELAYTOOL_PROG, relaytool, no)
+    fi
+
+    AC_MSG_CHECKING(whether we can weak link $1)
+
+    _RELAYTOOL_PROCESSED_NAME=`echo "$1" | sed 's/-/_/g;s/\./_/g;'`
+    _RELAYTOOL_UPPER_NAME=`echo $_RELAYTOOL_PROCESSED_NAME | tr '[[:lower:]]' '[[:upper:]]'`
+
+    if test "$RELAYTOOL_PROG" = "no"; then
+        AC_MSG_RESULT(no)
+        $3="-DRELAYTOOL_${_RELAYTOOL_UPPER_NAME}='static const int lib${_RELAYTOOL_PROCESSED_NAME}_is_present = 1; static int __attribute__((unused)) lib${_RELAYTOOL_PROCESSED_NAME}_symbol_is_present(char *m) { return 1; }' $$3"
+    else
+        AC_MSG_RESULT(yes)
+        $2=`echo $$2|sed 's/\`/\\\\\`/g;'`
+        $2="-Wl,--gc-sections \`relaytool --relay $1 $$2\`"
+       $3="-DRELAYTOOL_${_RELAYTOOL_UPPER_NAME}='extern int lib${_RELAYTOOL_PROCESSED_NAME}_is_present; extern int lib${_RELAYTOOL_PROCESSED_NAME}_symbol_is_present(char *s);' $$3"
+        $4
+    fi
+])
+